Each class is 45 minutes in length.

每一节课为45分钟。

《牛津词典》

The three-hour class is divided into four blocks of 45 minutes each.

三小时的课分成四节，每节45分钟。

《牛津词典》

Smith asked us to read a story and then write on it, all within 45 minutes.

史密斯让我们在45分钟内读一则故事并根据这则故事写一篇读后感。

youdao

Last year's Super Bowl telecast included a record 45 minutes and five seconds of air time for commercials.

VOA: standard.2010.01.27

Let's say you have four questions, you have 50 minutes, take out five minutes to read the paper, so that's 45 minutes.

你有四个问题，你有50分钟，花5分钟阅读考试，剩下45分钟。

麻省理工公开课 - 固态化学导论课程节选

The war was sold to his cabinet, to parliament and to the British people on the basis that Saddam Hussein was a dangerous man holding weapons of mass destruction (WMDs) that could be unleashed within 45 minutes.

VOA: standard.2009.12.13